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Initially, you must turn the fax machine off, and then unplug the power cord. Next, you must remove the board access cover, and then disconnect the harness of the CIS unit. After that, you must unplug the SW main harness and the scanner motor harness from the main PCB, and then remove the fixing screw of the FG wire. Now, you must open the top cover of the Brother intelliFAX 3800 Fax Machine, and then remove the screw from the link stopper. In the next step of the replacement procedure, you must release the link stopper, and then detach the top cover from the main unit. Once the top cover is removed, you must turn it upside down, and then remove the three screws from the shield plate of the CIS unit. Next, you must unplug the harness from the CIS unit, and then slide the CIS unit to the left. Finally, you must remove the CIS unit from the top cover, and then install the replacement component by executing the current procedure in reverse order.

When do I Replace a Control Panel Assembly in the Brother intelliFAX 3800 Fax Machine?

The control panel assembly must be replaced in the following circumstances:

The LCD of the control panel assembly does not operate – You must make sure that the harness of the control panel PCB is properly inserted into the main PCB. Please replace the control panel assembly if the problem persists.

The control panel is inoperative – You must make sure that the control panel assembly is installed correctly. Please install a new control panel assembly if the problem persists.

One or several of the control panel buttons does/do not operate

How to Install a Control Panel Assembly in the Brother intelliFAX 3800 Fax Machine

You must open the control panel assembly, and then open the top cover. After that, you must remove the handset mount by releasing the three latches, and then disconnect the panel-hook SW harness from the hook sensor PCB. Now, you must push the right arm of the control panel assembly inwards, and then remove the control panel assembly from the Brother intelliFAX 3800 Fax Machine. Finally, you must unpack the new control panel assembly, and then install it by executing the current procedure in reverse order.